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  <title>Check if a stream is a TTY</title>
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  <div id="layout-content"><div id="function.stream-isatty" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">stream_isatty</h1>
  <p class="verinfo">(PHP 7 &gt;= 7.2.0, PHP 8)</p><p class="refpurpose"><span class="refname">stream_isatty</span> &mdash; <span class="dc-title">Check if a stream is a TTY</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.stream-isatty-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>stream_isatty</strong></span>(<span class="methodparam"><span class="type">resource</span> <code class="parameter">$stream</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Determines if stream <code class="parameter">stream</code> refers to a valid terminal type device.
   This is a more portable version of <span class="function"><a href="function.posix-isatty.html" class="function">posix_isatty()</a></span>, since it works on Windows systems too.
  </p>
 </div>

 
 <div class="refsect1 parameters" id="refsect1-function.stream-isatty-parameters">
  <h3 class="title">参数</h3>
  <dl>
   
    <dt>
<code class="parameter">stream</code></dt>

    <dd>

     <p class="para">
      
     </p>
    </dd>

   
  </dl>

 </div>

 
 <div class="refsect1 returnvalues" id="refsect1-function.stream-isatty-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>

 
 <div class="refsect1 examples" id="refsect1-function.stream-isatty-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3775">
    <p><strong>示例 #1 <span class="function"><strong>stream_isatty()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     This command can be used to determine if a standard output / standard error stream is redirected to a file.
    </p></div>
    <div class="example-contents"><div class="shcode"><pre class="shcode">php -r &quot;var_export(stream_isatty(STDERR));&quot;</pre>
</div></div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen"><br />
     true<br />
    </div>
    <div class="example-contents"><div class="shcode"><pre class="shcode">php -r &quot;var_export(stream_isatty(STDERR));&quot; 2&gt;output.txt</pre>
</div></div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen"><br />
     false<br />
    </div>
   </div>
   </p>
 </div>

 
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